Living reference work entry
A spider is a topographical feature of several dendritic troughs radially converging to a common central depression exclusively found in the southern polar areas of Mars.
Its troughs are irregular, radiating away from the center and merge, branch, and anastomose in a seemingly random pattern. Spiders were found either isolated or in groups of sometimes overlapping individuals. During ice-free summer, spiders show no albedo difference to the surrounding substrate: they are solely topographical features. Early in local spring however their albedo often contrasts with the surroundings: either spider’s bluish-bright (standard processed HiRISE false colors) troughs stand out against red substrate or dark troughs against bright substrate. Spiders should not be confused with dark fan deposits that appear in spring in the same area (Fig. 1) ( Seasonal Polar Fan-Shaped...
KeywordsCentral Depression Polar Area Central Bulge Wide Trough Sinuous Channel
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- Hansen CJ, McEwen A et al (2007) Spring at the south pole of Mars. AGU Press ConferenceGoogle Scholar
- Hansen CJ, Byrne S, Portyankina G, Bourke M et al (2012) Observations of the northern seasonal polar cap on Mars: I. Spring sublimation activity and processes. Icarus. doi:10.1016/j.icarus.2012.09.024Google Scholar
- Kieffer HH (2000) Annual punctuated CO2 slab-ice and jets on Mars. Mars polar science conference, #4095Google Scholar
- Kieffer HH (2007) Cold jets in the Martian polar caps. J Geophys Res 112:E08005. doi:10.1029/2006JE002816Google Scholar
- Piqueux S, Christensen PR (2008) North and south subice gas flow and venting of the seasonal caps of Mars: a major geomorphological agent. J Geophys Res 113:E06005. doi:10.1029/2007JE003009Google Scholar
- Pommerol A, Portyankina G, Thomas N, Aye K-M, Hansen CJ, Vincendon M, Langevin Y (2011) Evolution of south seasonal cap during Martian spring: insights from high-resolution observations by HiRISE and CRISM on Mars Reconnaissance Orbiter. J Geophys Res 116:E08007. doi:10.1029/2010JE003790Google Scholar
- Portyankina G (2006) Atmosphere – surface vapor exchange and ices in the Martian polar regions. PhD thesisGoogle Scholar
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